My MacBook Pro (2010 model) was being really slow for some reason. On second thought, I should have reset the SMC before installing but I didn't. So I downloaded and started the installation of OS X Mavericks at 3 PM yesterday afternoon. It's been over 24 hours and still not installed yet. The computer's fans are running really high and the ETA is stuck at about "11 minutes" (although it sometimes rises to like 15 minutes). The progress bar is fully loaded. I'm gonna let it sit, but since the progress bar is fully loaded, how badly would I hurt the computer and my data by forcing it to restart if it doesn't finish by tonight?